// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_AUDIO_PULSE_PULSE_INPUT_H_
#define MEDIA_AUDIO_PULSE_PULSE_INPUT_H_

#include <pulse/pulseaudio.h>
#include <stddef.h>
#include <string>

#include "base/macros.h"
#include "base/threading/thread_checker.h"
#include "media/audio/agc_audio_stream.h"
#include "media/audio/audio_device_name.h"
#include "media/audio/audio_io.h"
#include "media/base/audio_block_fifo.h"
#include "media/base/audio_parameters.h"

namespace media {

class AudioManagerPulse;

class PulseAudioInputStream : public AgcAudioStream<AudioInputStream> {
public:
    PulseAudioInputStream(AudioManagerPulse* audio_manager,
        const std::string& device_name,
        const AudioParameters& params,
        pa_threaded_mainloop* mainloop,
        pa_context* context);

    ~PulseAudioInputStream() override;

    // Implementation of AudioInputStream.
    bool Open() override;
    void Start(AudioInputCallback* callback) override;
    void Stop() override;
    void Close() override;
    double GetMaxVolume() override;
    void SetVolume(double volume) override;
    double GetVolume() override;
    bool IsMuted() override;

private:
    // PulseAudio Callbacks.
    static void ReadCallback(pa_stream* handle, size_t length, void* user_data);
    static void StreamNotifyCallback(pa_stream* stream, void* user_data);
    static void VolumeCallback(pa_context* context, const pa_source_info* info,
        int error, void* user_data);
    static void MuteCallback(pa_context* context,
        const pa_source_info* info,
        int error,
        void* user_data);

    // Helper for the ReadCallback.
    void ReadData();

    // Utility method used by GetVolume() and IsMuted().
    bool GetSourceInformation(pa_source_info_cb_t callback);

    AudioManagerPulse* audio_manager_;
    AudioInputCallback* callback_;
    std::string device_name_;
    AudioParameters params_;
    int channels_;
    double volume_;
    bool stream_started_;

    // Set to true in IsMuted() if user has muted the selected microphone in the
    // sound settings UI.
    bool muted_;

    // Holds the data from the OS.
    AudioBlockFifo fifo_;

    // PulseAudio API structs.
    pa_threaded_mainloop* pa_mainloop_; // Weak.
    pa_context* pa_context_; // Weak.
    pa_stream* handle_;

    base::ThreadChecker thread_checker_;

    DISALLOW_COPY_AND_ASSIGN(PulseAudioInputStream);
};

} // namespace media

#endif // MEDIA_AUDIO_PULSE_PULSE_INPUT_H_
